28618387 has 8 divisors (see below), whose sum is σ = 32874336. Its totient is φ = 24404352.

The previous prime is 28618379. The next prime is 28618411. The reversal of 28618387 is 78381682.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28618387 - 2³ = 28618379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28618087) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8998 + ... + 11755.

It is an arithmetic number, because the mean of its divisors is an integer number (4109292).

Almost surely, 2^28618387 is an apocalyptic number.

28618387 is a deficient number, since it is larger than the sum of its proper divisors (4255949).

28618387 is a wasteful number, since it uses less digits than its factorization.

28618387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20957.

The product of its digits is 129024, while the sum is 43.

The square root of 28618387 is about 5349.6155936665. The cubic root of 28618387 is about 305.8781001635.

The spelling of 28618387 in words is "twenty-eight million, six hundred eighteen thousand, three hundred eighty-seven".